<template>
    <div class="list" ref="wrapper">
       <div>
        <div class="area">
            <div class="title border-topbottom">当前城市</div>
            <div class="button-list">
                <div class="button-wrapper">
                <div class="button">{{this.currentCity}}</div>
                </div>
            </div>
        </div>
        <div class="area">
            <div class="title border-topbottom">热门城市</div>
            <div class="button-list">
                <div class="button-wrapper" 
                v-for="item of hot" 
                :key="item.id"
                @click="handleCityClick(item.name)">
                <div class="button">{{item.name}}</div>
                </div>
            </div>
        </div>
        <div class="area" v-for="(item, key) of cities" :key="key" :ref="key">
            <div class="title border-topbottom">{{key}}</div>
            <div class="item-list">
                <div class="item border-bottom" 
                v-for="innerItem of item" 
                :key="innerItem.id"
                @click="handleCityClick(innerItem.name)">{{innerItem.name}}</div>
            </div>
        </div>
      </div>
    </div>
</template>
<script>
import BScroll from 'better-scroll'
import { mapState,mapMutations} from 'vuex'
export default {
    name:"CityList",
    props:{
        hot:Array,
        cities:Object,
        letter:String
    },
    computed: {
      ...mapState({
        currentCity: 'city'
      })
    },
    methods: {
      handleCityClick (city) {
        this.changeCity(city)
        this.$router.push('/')
      },
      ...mapMutations(['changeCity'])
    },
    mounted() {
        this.scroll = new BScroll(this.$refs.wrapper)
    },
    watch: {
        letter () {
            if (this.letter) {
                const element = this.$refs[this.letter][0]
                this.scroll.scrollToElement(element)
            }
        }
    },
}
</script>
<style lang="stylus" scoped>
@import '~styles/varibles.styl'
.border-topbottom
  &:before
    border-color:#ccc
  &:after
    border-color:#ccc
.border-bottom
  &:before
    border-color:#ccc
.list
  overflow :hidden
  position :absolute
  top :1.58rem
  left :0
  right :0
  bottom :0
  .title
    line-height :.54rem
    background :#eee
    padding-left :.2rem
    color :#666
    font-size :.26rem
  .button-list
    overflow :hidden
    padding:.1rem .6rem .1rem .1rem
    .button-wrapper
      float :left
      width :33.33%
      .button
        margin :.1rem
        padding:.1rem 0
        text-align :center
        border:.02rem solid #ccc
        border-radius :.06rem
  .item-list
     .item
        line-height :.74rem
        color :#666
        padding-left :.2rem
</style>